April, igoi] 



PSYCHE. 



187 



THE SPECIES OF DIAPHEROMERA (PHASMIDAE) FOUND IX 

 THE UNITED STATES AND CANADA. 



BY SAMUEL H. SCUDDER, CAMBRIDGE, MASS. 



The common -'walking stick" of the 

 oak bushes of the northern United States, 

 D. femorata (Say) , was the only species 

 known to Gray, when in 1835 he founded 

 this genus. It was not until 1864 that a 

 second, intimately allied, species was 

 added by Walsh, and since 1875, when 

 a third much larger species was described 

 by Still, no further additions have been 



made. From rather meagre material in 

 my collection I can now add two other 

 species, one from North Carolina, the 

 other from New Mexico. No species 

 appears to occur west of the continental 

 divide. I subjoin a table for the easy 

 separation of the species, based princi- 

 pally on the male sex. 



Table of the United States species of Diafiheromera. 



Male cerci more or less, generally conspicuously, arcuate. 

 b^. Larger and stouter form ; under side of middle and hind femora distinctly 

 spined throughout ; male cerci much broader apically than at base, more or 

 less spatulate. .......... denticnis. 



b^. Smaller and slenderer forms ; middle and hind femora without conspicuous 



spines beneath, excepting the subapical spine; male cerci subequal throughout. 



e^. Ninth abdominal segment of male apically inflated, and here nearly half 



as broad again as at base, the seventh and eighth segments of subequal 



length .......... Carolina. 



e"^. Ninth abdominal segment of male subequal, scarcely larger at apex 

 than at base, the seventh segment much longer than the eighth. 



</'. Male cerci with a blunt tooth at inner inferior base; female 

 cerci relatively stout, about half as long as last dorsal segment 



fe?norata. 

 d'^. Male cerci with a sharp thorn at inner inferior base : female 

 cerci relatively slender, almost or quite as long as last dorsal 

 segment .......... 7'eliei. 



Male cerci rigidly straight ....... mesillana. 



Diapheromera denticrus. 



Diapheromera denticrus Stal, Rec. 

 Orth.,iii, 76 (1875). 



Originally described from Opelousas, 

 La. My specimens all come from 

 Texas (Belfrage), New Braunfels, Tex. 

 (Lincecum), and the Gulf coast of 



